think your barking up the wrong tree man. Stiff ride is either from A- stiff a$$ shocks and/or stiff springs (strong rate). If you have stock shocks... that's "A" right there. Get some Rancho shocks, they are stiff and i like them. B- get some beffier leafs in the back and or Tbars upfront. those coil spacers will only preload it, not chaning the rate at which the spring will compress b/c that's determined by the metal, gauge, etc. basically engineering of the spring, Tbar or Leaf. You can also run more than 1 schock per wheel. you could run 2 schocker per wheel.... that'll stiffen it up. I think your best bet would be Rancho shocks and some Beefy aftermarket springs.